Error states that TextField widgets require a Material widget ancestor. Simply wrapping your whole loginWidget into Scaffold will solve the problem. Widget LoginPage() { return new Scaffold(body: *your whole code*) }
Let's say you set widget height to 200, but to different screen, there might not be enough space for the widget to display, in this case, you can use Flexible widget: Flexible( child: Hero( tag: 'flash', child: Container( height: 200.0, child: Image.
本文主要介绍Flutter布局中的FittedBox.AspectRatio.ConstrainedBox,详细介绍了其布局行为以及使用场景,并对源码进行了分析. 1. FittedBox Scales and positions its child within itself according to fit. 1.1 简介 按照其官方的介绍,它主要做了两件事情,缩放(Scale)以及位置调整(Position). FittedBox会在自己的尺寸范围内缩放并且调整child位置,使得chil